Mercurial > dropbear

annotate libtommath/bn_mp_grow.c @ 1792:2bf1e97ba3cd

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Update INSTALL (#113) Make Git/Mercurial instructions easier to understand
author Xenhat <commits@xenh.at>
date Thu, 17 Dec 2020 04:35:48 -0500
parents 1051e4eea25a
children
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_GROW_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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6 /* grow as required */
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7 mp_err mp_grow(mp_int *a, int size)
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8 {
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9 int i;
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10 mp_digit *tmp;
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11
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parents: 1470
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12 /* if the alloc size is smaller alloc more ram */
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parents: 1470
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13 if (a->alloc < size) {
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14 /* reallocate the array a->dp
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15 *
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16 * We store the return in a temporary variable
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parents: 1470
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17 * in case the operation failed we don't want
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parents: 1470
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18 * to overwrite the dp member of a.
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19 */
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20 tmp = (mp_digit *) MP_REALLOC(a->dp,
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21 (size_t)a->alloc * sizeof(mp_digit),
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22 (size_t)size * sizeof(mp_digit));
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23 if (tmp == NULL) {
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parents: 1470
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24 /* reallocation failed but "a" is still valid [can be freed] */
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25 return MP_MEM;
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26 }
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28 /* reallocation succeeded so set a->dp */
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29 a->dp = tmp;
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31 /* zero excess digits */
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32 i = a->alloc;
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33 a->alloc = size;
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34 MP_ZERO_DIGITS(a->dp + i, a->alloc - i);
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35 }
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36 return MP_OKAY;
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37 }
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38 #endif